“When he saw me, he turned white,” Mr. Young recalled in a 1995 interview with the USC Shoah Foundation.

Mr. Young was one of only about five people out of a Jewish population of about 300 in the town of Kvedarna, Lithuania, to survive the war.

Mr. Young’s daughter, Judy Litz, said the World Jewish Congress brought him and other survivors from Israel and Australia to testify against the doctor, who was accused of participating in an SS murder squad that shot 220 Jews.

In the camps, the guards referred to prisoners as ‘sauhund’ — bloody swine — and excrement.

Mr. Young recalled that he “just walked over to him sitting by the door” and said, “Now comes the time I’m going to call you what you called us.’’

Scheu was convicted and given a life sentence of hard labor.

It was a turnabout both psychological and physical for Mr. Young, who recalled in the Shoah Foundation interview how weak he’d been when American troops liberated Dachau.

“I was lying on the floor,” he said. “I lifted up my head, and I dropped it to the ground.”

After the war, his nights were filled with nightmares and his days with thoughts of the family members he lost to the Holocaust — more than 20 of them.